When a target in an SMP group is unavailable, the gdb layer might get an
event for a different target in that SMP group, but not one that is the
primary target for that gdb connection. So propagate events if they're
for any of the targets in the SMP group, not just if it's for the first
one in that group.
Change-Id: I8d6738762acc7c0aef96f56ce2cb7f2eeb233b33
Signed-off-by: Tim Newsome <tim@sifive.com>